The present disclosure discloses a bumper beam for a motor vehicle including a center portion free of mobility-specificity and side portions that may be altered according to design and specification of the mobility to secure collision performance so that the bumper back beam of which collision performance is secured and which satisfies various mobilities may be flexibly applied. Accordingly, it is possible to configure the back beam satisfying various mobilities based on a standardized model to secure collision performance so that manufacturing cost is reduced by assembling and producing the back beams with minimum molds.